Find the mean and standard deviation of the specified probability density function.f(x) = 0.07e-0.07x for [0, ?)
A. ? = 14.29, ? = 15.1
B. ? = 14.1, ? = 14.29
C. ? = 14.29, ? = 14.29
D. ? = 1.429, ? = 1.249
Answer: C
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Find the unit tangent vector of the given curve.r(t) = (4 - 2t)i + (2t - 9)j + (10 + t)k
A. T(t) = 
i - 
j - 
k
B. T(t) = - 
i + 
j + 
k
C. T(t) = 
i - 
j - 
k
D. T(t) = - 
i + 
j + 
k
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. b
B. 7
C. 
D. 
Use the given sets below to determine whether the statement is true or false.A = {1, 3, 5, 7}, B = {5, 6, 7, 8}, C = {5, 8}, D = {2, 5, 8}, U = {1, 2, 3, 4, 5, 6, 7, 8}.C ? D
A. True B. False
Write the domain and range of the function in interval notation.f(x) = |2x + 1|
A. D: (0, ?); R: [0, ?) B. D: (-?, 0) ? (0, ?); R: [0, ?) C. D: (-?, ?); R: [0, ?) D. D: (-1, ?); R: [0, ?)